注意：xsl的disable-output-escaping="yes"
其核心就是利用disable-output-escaping="yes"
MSDN上对它的描述如下：
disable-output-escaping
Defaultis"no".Ifthevalueis"yes",atextnodegeneratedbyinstantiatingtheelementwillbeoutputwithoutanyescaping.Forexample,thefollowinggeneratesthesinglecharacter"<".
<
Note??disable-output-escaping="yes"canbeusedtogeneratenon-well-formeddocuments,andthusshouldbeusedwithcaution,becausenon-well-formedoutputmaygenerateerrorsincertaincircumstances.Forexample,transformNodeToObjecttoanXMLdocumentrequiresthattheresultbewell-formedandthusmaynotcompleteifdisable-output-escapinghasaffectedthewell-formednessofthedocument.Considerdisable-output-escaping="yes"anadvancedfeaturetobeusedonlywhenthepotentialdangersareunderstood.
